Variable Retention Force Spring Clip for Dynamic Loads
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Solution Overview
Problem
Electronic device enclosure components prone to unintentional separation during abrupt forces, such as drops, leading to potential disconnection and damage of internal components, while requiring intentional separation for maintenance.
Innovation Solution
A retention system comprising a spring clip with pre-tensioned retention members and a compressible layer that responds to force rates, providing a variable retention force to resist separation during unintentional events while allowing intentional disassembly by adjusting the force response based on the rate of applied forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a retention system uses a simple attachment mechanism, then ease of assembly is improved, but resistance to abrupt separation forces deteriorates
Solution Approach 1:
The retention system employs a spring clip that dynamically adjusts its retention force based on the rate of applied force. During normal operation, the spring maintains a baseline retention force that allows easy assembly and disassembly. During abrupt separation events like drops, the spring's dynamic response generates increased retention force to prevent component separation.
Solution Approach 2:
The system changes the retention force parameter based on the strain rate of applied forces. The spring clip's mechanical properties cause it to exert different retention forces under different loading conditions - lower forces during controlled assembly/disassembly and higher forces during abrupt separation events, thereby resolving the contradiction between ease of operation and resistance to separation.
2Reliability
If a retention system uses a strong retention force, then resistance to separation is improved, but ease of intentional disassembly deteriorates
Solution Approach 1:
The spring clip provides strong retention force under normal conditions to prevent separation, but when a sustained disassembly force is applied, the spring dynamically adjusts by compressing and allowing controlled release. This dynamic behavior enables the same mechanism to provide both strong retention and easy intentional disassembly.
Solution Approach 2:
The spring clip is pre-loaded to exert a retention force that opposes separation. However, this preliminary anti-action is designed to yield under sustained force, allowing intentional disassembly while maintaining strong resistance against abrupt separation forces that occur during normal use.
3Reliability
If the retention system responds to all forces equally, then protection during drops is improved, but ability to distinguish intentional disassembly deteriorates
Solution Approach 1:
The retention system's spring mechanism responds differently based on the rate of force application. During sudden drops, the spring's dynamic response generates high retention force to protect components. During intentional disassembly where force is applied more gradually and sustainably, the spring compresses and allows release, enabling the system to distinguish between these different force scenarios.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents unintentional disassembly of electronic device components during accidental drops while enabling intentional disassembly by distinguishing between sudden and gradual force applications, thus protecting internal components and facilitating maintenance.
Implementation Method 1
The first and second retention members are pre-tensioned, or biased, together by a spring force that opposes separation of the retention members
Implementation Method 2
The retention system also includes a compressible layer that exerts a reaction force on the second retention member in response to an externally applied force. A magnitude of the reaction force is proportional to a rate at which the external force is applied
Data Source
AI summary
A system and method for retaining enclosure components of an electronic device that can experience a range of dynamic forces is disclosed. The electronic device includes a cover component and a housing component. The electronic device also contains a retention system that includes a spring clip and a compressible layer for retaining a portion of the cover component to the housing component. The retention system provides a variable retention force that resists the separation of the cover and housing components. If the electronic device experiences a force that is applied abruptly, such as in the case of an unintentional drop event, the variable retention force is high, increasing the retention between the cover and housing components. If the electronic device experiences a slower and gradual force, such as in the case of intentional disassembly, the variable retention force is low, allowing the disassembly of the electronic device.